fftools/opt_common: replace exit_program() with returning error codes

fftools/opt_common.c

@@ -1159,7 +1159,9 @@ int init_report(const char *env, FILE **file)
             report_file_level = strtol(val, &tail, 10);
             if (*tail) {
                 av_log(NULL, AV_LOG_FATAL, "Invalid report file level\n");
-                exit_program(1);
+                av_free(key);
+                av_free(val);
+                return AVERROR(EINVAL);
             }
             envlevel = 1;
         } else {
@@ -1219,7 +1221,7 @@ int opt_max_alloc(void *optctx, const char *opt, const char *arg)
     max = strtol(arg, &tail, 10);
     if (*tail) {
         av_log(NULL, AV_LOG_FATAL, "Invalid max_alloc \"%s\".\n", arg);
-        exit_program(1);
+        return AVERROR(EINVAL);
     }
     av_max_alloc(max);
     return 0;
@@ -1293,7 +1295,7 @@ int opt_loglevel(void *optctx, const char *opt, const char *arg)
                "Possible levels are numbers or:\n", arg);
         for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
             av_log(NULL, AV_LOG_FATAL, "\"%s\"\n", log_levels[i].name);
-        exit_program(1);
+        return AVERROR(EINVAL);
     }
 
 end: